You can't cast Hunter's Edge unless you choose both a creature you control and a creature you don't control as targets.
23-06-2020
wotc
If either creature is an illegal target as Hunter's Edge tries to resolve, the creature you control won't deal damage.
23-06-2020
wotc
If the creature you don't control is an illegal target as Hunter's Edge tries to resolve but the creature you control is a legal target, you just put a +1/+1 counter on the creature you control.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.